单项选择题

Plato believed (that) if we (rely on) our senses, we would not be able (to acquire) true knowledge of (the universe).（）

A.that
B.rely on
C.to acquire
D.the universe

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单项选择题

The main boyhood (interesting) of (psychologist) Jean Piaget (was) the observation of animals (in their) natural habitat(栖息地).（）

A.interesting
B.psychologist
C.was
D.in their

单项选择题

Birds (whose) coloring blends in with the leaves (do not) seen (as easily as) (those) with brighter feathers.（）

A.whose
B.do not
C.as easily as
D.those

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